The geography of Indonesia is dominated by volcanoes that are formed due to subduction zones between the Eurasian plate and the Indo-Australian plate. Some of the volcanoes are notable for their eruptions, for instance, Krakatoa for its global effects in 1883, the Lake Toba Caldera for its supervolcanic eruption estimated to have occurred 74,000 years before present which was responsible for six years of volcanic winter, and Mount Tambora for the most violent eruption in recorded history in 1815.
Volcanoes in Indonesia are part of the Pacific Ring of Fire. The 150 entries in the list below are grouped into six geographical regions, four of which belong to the volcanoes of the Sunda Arc trench system. The remaining two groups are volcanoes of Halmahera, including its surrounding volcanic islands, and volcanoes of Sulawesi and the Sangihe Islands. The latter group is in one volcanic arc together with the Philippine volcanoes.
The most active volcano is Mount Merapi on Java. Since AD 1000, Kelut has erupted more than 30 times, of which the largest eruption was at scale 5 on the Volcanic Explosivity Index (VEI), while Mount Merapi has erupted more than 80 times. The International Association of Volcanology and Chemistry of the Earth's Interior has named Mount Merapi as a Decade Volcano since 1995 because of its high volcanic activity.
As of 2012, Indonesia has 127 active volcanoes and about 5 million people active within the danger zones. It has been conjectured that the earthquake and tsunami event of 26 December 2004 could trigger eruptions, with Mount Sinabung (dormant since the 1600s) erupting in 2010 as a possible example.
There is no single standard definition for a volcano. It can be defined from individual vents, volcanic edifices or volcanic fields. Interior of ancient volcanoes may have been eroded, creating a new subsurface magma chamber as a separate volcano. Many contemporary active volcanoes rise as young parasitic cones from flank vents or at a central crater. Some volcanic cones are grouped into one volcano name, for instance, the Tengger caldera complex, although individual vents are named by local people. The status of a volcano, either active or dormant, cannot be defined precisely. An indication of a volcano is determined by either its historical records, radiocarbon dating, or geothermal activities.
The primary source of the list below is taken from the Volcanoes of the World book, compiled by two volcanologists Tom Simkin and Lee Siebert,[a] in which active volcanoes in the past 10,000 years (Holocene) are listed. Particularly for Indonesia, Simkin and Siebert used a catalogue of active volcanoes from the International Association of Volcanology and Chemistry of the Earth's Interior publication series.[b] The Simkin and Siebert list is the most complete list of volcanoes in Indonesia, but the accuracy of the record varies from one region to another in terms of contemporary activities and fatalities in recent eruptions. Complementary sources for the latest volcanic data are taken from the Volcanological Survey of Indonesia, a governmental institution which is responsible for volcanic activities and geological hazard mitigation in Indonesia, and some academic resources.
The geography of Sumatra is dominated by a mountain range called Bukit Barisan (lit: "a row of hills"). The mountain range spans nearly 1,700 km (1,100 mi) from the north to the south of the island, and it was formed by movement of the Australian tectonic plate. The plate moves with a convergence rate of 5.5 cm/year which has created major earthquakes on the western side of Sumatra including the 2004 Sumatra–Andaman earthquake. The tectonic movement has been responsible not only for earthquakes, but also for the formation of magma chambers beneath the island.
Only one of the 35 active volcanoes, Weh, is separated from the Sumatran mainland. The separation was caused by a large eruption that filled the lowland between Weh and the rest of the mainland with sea water in the Pleistocene epoch. The largest volcano of Sumatra is the supervolcano Toba within the 100 km (62 mi) × 30 km (19 mi) Lake Toba, which was created after a caldera collapse (est. in 74,000 Before Present). The eruption is estimated to have been at level eight on the VEI scale, the highest level for a volcanic eruption. The highest peak of the mountain range is Mount Kerinci with an elevation of 3,800 m (12,467 ft).
|Name||Shape||Elevation||Last eruption (VEI)||Geolocation|
|Weh||stratovolcano||617 metres (2,024 ft)||Pleistocene|
|Seulawah Agam||stratovolcano||1,810 metres (5,940 ft)||1839 (2)|
|Peuet Sague||complex volcano||2,801 metres (9,190 ft)||25 December 2000 (2)|
|Geureudong||stratovolcano||2,885 metres (9,465 ft)||1937|
|Kembar||shield volcano||2,245 metres (7,365 ft)||Pleistocene|
|Sibayak||stratovolcano||2,212 metres (7,257 ft)||unknown|
|Sinabung||stratovolcano||2,460 metres (8,070 ft)||10 August 2020 (2)|
|Toba||supervolcano||2,157 metres (7,077 ft)||75000 BC (8)|
|Helatoba-Tarutung||fumarole field||1,100 metres (3,600 ft)||Pleistocene|
|Imun||unknown||1,505 metres (4,938 ft)||unknown|
|Sibualbuali||stratovolcano||1,819 metres (5,968 ft)||unknown|
|Lubukraya||stratovolcano||1,862 metres (6,109 ft)||unknown|
|Sorikmarapi||stratovolcano||2,145 metres (7,037 ft)||1986 (1)|
|Talakmau||complex volcano||2,919 metres (9,577 ft)||unknown|
|Marapi||complex volcano||2,891 metres (9,485 ft)||2018|
|Tandikat||stratovolcano||2,438 metres (7,999 ft)||1924 (1)|
|Talang||stratovolcano||2,597 metres (8,520 ft)||12 April 2005 (2)|
|Kerinci||stratovolcano||3,800 metres (12,500 ft)||2019 (on going)|
|Hutapanjang||stratovolcano||2,021 metres (6,631 ft)||unknown|
|Sumbing||stratovolcano||2,507 metres (8,225 ft)||23 May 1921 (2)|
|Kunyit||stratovolcano||2,151 metres (7,057 ft)||unknown|
|Belirang-Beriti||complex volcano||1,958 metres (6,424 ft)||unknown|
|Bukit Daun||stratovolcano||2,467 metres (8,094 ft)||unknown|
|Kaba||stratovolcano||1,952 metres (6,404 ft)||22 August 2000 (1)|
|Dempo||stratovolcano||3,173 metres (10,410 ft)||2018 (1)|
|Patah||unknown||2,817 metres (9,242 ft)||unknown|
|Bukit Lumut Balai||stratovolcano||2,055 metres (6,742 ft)||unknown|
|Besar||stratovolcano||1,899 metres (6,230 ft)||April 1940 (1)|
|Ranau||caldera||1,881 metres (6,171 ft)||unknown|
|Sekincau Belirang||caldera||1,719 metres (5,640 ft)||unknown|
|Suoh||caldera||1,000 metres (3,300 ft)||10 July 1933 (4)|
|Hulubelu||caldera||1,040 metres (3,410 ft)||1836|
|Rajabasa||stratovolcano||1,281 metres (4,203 ft)||1798|
Sunda Strait and Java
The Sunda Strait separates the islands of Sumatra and Java with the volcanic island Krakatoa lying between them. Krakatau erupted violently in 1883, destroying two-thirds of the island and leaving a large caldera under the sea. This cataclysmic explosion was heard as far away as the island of Rodrigues near Mauritius (approx. 4,800 kilometres (3,000 mi) away). A new parasitic cone, called Anak Krakatau (or the child of Krakatau), rose from the sea at the centre of the caldera in 1930. The other Krakatau islets from the 1883 eruptions are known as Sertung, Panjang and Rakata.
Java is a relatively small island compared to Sumatra, but it has a higher concentration of active volcanoes. There are 45 active volcanoes on the island excluding 20 small craters and cones in the Dieng volcanic complex and the young cones in the Tengger caldera complex. Some volcanoes are grouped together in the list below because of their close location. Mount Merapi, Semeru and Kelud are the most active volcanoes in Java. Mount Semeru has been continuously erupting since 1967. Mount Merapi has been named as one of the Decade Volcanoes since 1995. Ijen has a unique colourful caldera lake which is an extremely acidic natural reservoir (pH<0.3). There are sulfur mining activities at Ijen, where miners collect highly concentrated sulfur rocks by hand.
|Name||Shape||Elevation||Last eruption (VEI)||Geolocation|
|Krakatau||caldera||813 metres (2,667 ft)||2019 (ongoing)|
|Pulosari||stratovolcano||1,346 metres (4,416 ft)||unknown|
|Gunung Karang||stratovolcano||1,778 metres (5,833 ft)||unknown|
|Kiaraberes-Gagak||stratovolcano||1,511 metres (4,957 ft)||6 April 1939 (1)|
|Perbakti||stratovolcano||1,699 metres (5,574 ft)||unknown|
|Salak||stratovolcano||2,211 metres (7,254 ft)||31 January 1938 (2)|
|Gede||stratovolcano||2,958 metres (9,705 ft)||13 March 1957 (2)|
|Patuha||stratovolcano||2,434 metres (7,986 ft)||unknown|
|Wayang-Windu||lava dome||2,182 metres (7,159 ft)||unknown|
|Malabar||stratovolcano||2,343 metres (7,687 ft)||unknown|
|Tangkuban Perahu||stratovolcano||2,084 metres (6,837 ft)||26 June 2019 (1)|
|Papandayan||stratovolcano||2,665 metres (8,743 ft)||11 November 2002 (2)|
|Kendang||stratovolcano||2,608 metres (8,556 ft)||unknown|
|Kamojang||stratovolcano||1,730 metres (5,680 ft)||Pleistocene|
|Guntur||complex volcano||2,249 metres (7,379 ft)||16 October 1847 (2)|
|Tampomas||stratovolcano||1,684 metres (5,525 ft)||unknown|
|Galunggung||stratovolcano||2,168 metres (7,113 ft)||9 January 1984 (1)|
|Talagabodas||stratovolcano||2,201 metres (7,221 ft)||unknown|
|Karaha||fumarole||1,155 metres (3,789 ft)||unknown|
|Cereme||stratovolcano||3,078 metres (10,098 ft)||1951|
|Slamet||stratovolcano||3,432 metres (11,260 ft)||2014|
|Dieng||complex volcano||2,565 metres (8,415 ft)||2018 (1)|
|Sundoro||stratovolcano||3,136 metres (10,289 ft)||29 October 1971 (2)|
|Sumbing||stratovolcano||3,371 metres (11,060 ft)||1730 (?)|
|Ungaran||stratovolcano||2,050 metres (6,730 ft)||unknown|
|Telomoyo||stratovolcano||1,894 metres (6,214 ft)||unknown|
|Merbabu||stratovolcano||3,145 metres (10,318 ft)||1797 (2)|
|Merapi||stratovolcano||2,968 metres (9,738 ft)||2019 (ongoing)|
|Muria||stratovolcano||1,625 metres (5,331 ft)||160 BC ± 30 years|
|Lawu||stratovolcano||3,265 metres (10,712 ft)||28 November 1885 (1)|
|Wilis||stratovolcano||2,563 metres (8,409 ft)||unknown|
|Kelud||stratovolcano||1,731 metres (5,679 ft)||13 February 2014 (4)|
|Kawi-Butak||stratovolcano||2,651 metres (8,698 ft)||unknown|
|Arjuno-Welirang||stratovolcano||3,339 metres (10,955 ft)||15 August 1952 (0)|
|Penanggungan||stratovolcano||1,653 metres (5,423 ft)||unknown|
|Malang Plain||maar||680 metres (2,230 ft)||unknown|
|Semeru||stratovolcano||3,676 metres (12,060 ft)||2020 (ongoing)|
|Bromo||stratovolcano||2,329 metres (7,641 ft)||2019|
|Lamongan||stratovolcano||1,651 metres (5,417 ft)||5 February 1898 (2)|
|Lurus||complex volcano||539 metres (1,768 ft)||unknown|
|Iyang-Argapura||complex volcano||3,088 metres (10,131 ft)||unknown|
|Raung||stratovolcano||3,332 metres (10,932 ft)||29 June 2015 (?)|
|Ijen||stratovolcano||2,799 metres (9,183 ft)||28 June 1999 (1)|
|Baluran||stratovolcano||1,247 metres (4,091 ft)||unknown|
Note: Height of Krakatau is of Rakata, not of the active Anak Krakatau
Lesser Sunda Islands
The Lesser Sunda Islands is a small archipelago which, from west to east, consists of Bali, Lombok, Sumbawa, Flores, Sumba and the Timor islands; all are located at the edge of the Australian continental shelf. Volcanoes in the area are formed because of oceanic crusts and the movement of the shelf itself. Some volcanoes completely form an island, for instance, the Sangeang Api island. Mount Tambora, on Sumbawa island, erupted on 5 April 1815, with a scale 7 on the VEI and is considered the most violent eruption in recorded history.
|Name||Island||Shape||Elevation||Last eruption (VEI)||Geolocation|
|Merbuk||Bali||unknown||1,386 metres (4,547 ft)||unknown||-|
|Bratan||Bali||caldera||2,276 metres (7,467 ft)||unknown|
|Batur||Bali||caldera||1,717 metres (5,633 ft)||2000 (1)|
|Agung||Bali||stratovolcano||3,031 metres (9,944 ft)||2019 (ongoing)|
|Samalas||Lombok||stratovolcano||2,867 metres (9,406 ft)||1257 (7)|
|Rinjani||Lombok||stratovolcano||3,726 metres (12,224 ft)||2016 (2)|
|Tambora||Sumbawa||stratovolcano||2,722 metres (8,930 ft)||1967 ± 20 years (0)|
|Sangeang Api||Sangeang||complex volcano||1,949 metres (6,394 ft)||2019 (ongoing)|
|Wai Sano||Flores||caldera||903 metres (2,963 ft)||unknown|
|Poco Leok||Flores||unknown||1,675 metres (5,495 ft)||unknown|
|Ranakah||Flores||lava dome||2,100 metres (6,900 ft)||March 1991 (1)|
|Inierie||Flores||stratovolcano||2,245 metres (7,365 ft)||8050 BC|
|Inielika||Flores||complex volcano||1,559 metres (5,115 ft)||11 January 2001 (2)|
|Ebulobo||Flores||stratovolcano||2,124 metres (6,969 ft)||27 February 1969 (2)|
|Iya||Flores||stratovolcano||637 metres (2,090 ft)||27 January 1969 (3)|
|Sukaria||Flores||caldera||1,500 metres (4,900 ft)||unknown|
|Ndete Napu||Flores||fumarole||750 metres (2,460 ft)||unknown|
|Kelimutu||Flores||complex volcano||1,639 metres (5,377 ft)||3 June 1968 (1)|
|Paluweh||Palu'e||stratovolcano||875 metres (2,871 ft)||3 February 1985 (1)|
|Egon||Flores||stratovolcano||1,703 metres (5,587 ft)||2008|
|Ilimuda||Flores||stratovolcano||1,100 metres (3,600 ft)||unknown|
|Lewotobi||Flores||stratovolcano||1,703 metres (5,587 ft)||30 May 2003 (2)|
|Leroboleng||Flores||complex volcano||1,117 metres (3,665 ft)||26 June 2003 (3)|
|Riang Kotang||Flores||fumarole||200 metres (660 ft)||unknown|
|Iliboleng||Adonara Island||stratovolcano||1,659 metres (5,443 ft)||June 1993 (1)|
|Lewotolo||Lembata||stratovolcano||1,423 metres (4,669 ft)||2020 (ongoing)|
|Ililabalekan||Lembata||stratovolcano||1,018 metres (3,340 ft)||unknown|
|Iliwerung||Lembata||complex volcano||1,018 metres (3,340 ft)||22 May 1999 (0)|
|Batu Tara||Komba island||stratovolcano||748 metres (2,454 ft)||2007-15 (2)|
|Sirung||Pantar Island||complex volcano||862 metres (2,828 ft)||2015 (2)|
|Yersey||-||submarine||−3,800 metres (−12,500 ft)||unknown|
The Banda Sea in the south of the Molucca archipelago includes a small group of islands. Three major tectonic plates beneath the sea, Eurasian, Pacific and Indo-Australian plates, have been converging since the Mesozoic epoch. Volcanoes in the Banda Sea are mainly islands, but some are submarine volcanoes.
|Name||Shape||Elevation||Last eruption (VEI)||Geolocation|
|Emperor of China||submarine||−2,850 metres (−9,350 ft)||unknown|
|Nieuwerkerk||submarine||−2,285 metres (−7,497 ft)||unknown|
|Gunungapi Wetar||stratovolcano||282 metres (925 ft)||1699 (3)|
|Wurlali||stratovolcano||868 metres (2,848 ft)||3 June 1892 (2)|
|Teon||stratovolcano||655 metres (2,149 ft)||3 June 1904 (2)|
|Nila||stratovolcano||781 metres (2,562 ft)||7 May 1968 (1)|
|Serua||stratovolcano||641 metres (2,103 ft)||18 September 1921 (2)|
|Manuk||stratovolcano||282 metres (925 ft)||unknown|
|Banda Api||caldera||640 metres (2,100 ft)||9 May 1988 (3)|
Sulawesi and Sangihe Islands
Four peninsulas dominate the shape of Sulawesi island (formerly known as Celebes). The central part is a high mountainous area, but mostly non-volcanic. Active volcanoes are found in the northern peninsula and continuously stretch to the north to Sangihe Islands. The Sangihe Islands mark the border with the Philippines.
|Name||Shape||Elevation||Last eruption (VEI)||Geolocation|
|Colo||stratovolcano||507 metres (1,663 ft)||18 July 1983 (4)|
|Ambang||complex volcano||1,795 metres (5,889 ft)||1845 ± 5 years|
|Soputan||stratovolcano||1,784 metres (5,853 ft)||December 2018|
|Sempu||caldera||1,549 metres (5,082 ft)||unknown|
|Tondano||caldera||1,202 metres (3,944 ft)||unknown|
|Lokon-Empung||stratovolcano||1,580 metres (5,180 ft)||2015|
|Mahawu||stratovolcano||1,324 metres (4,344 ft)||16 November 1977 (0)|
|Klabat||stratovolcano||1,995 metres (6,545 ft)||unknown|
|Tongkoko||stratovolcano||1,149 metres (3,770 ft)||1880 (1)|
|Ruang||stratovolcano||725 metres (2,379 ft)||25 September 2002 (4)|
|Karangetang||stratovolcano||1,784 metres (5,853 ft)||2019 (ongoing)|
|Banua Wuhu||submarine||−5 metres (−16 ft)||18 July 1919 (3)|
|Awu||stratovolcano||1,320 metres (4,330 ft)||2 June 2004 (2)|
|Submarine 1922||submarine||−5,000 metres (−16,000 ft)||unknown|
Halmahera island in the north of Molucca archipelago has been formed by the movement of three tectonic plates resulting in two intersecting mountain ranges, which form four rocky peninsulas separated by three deep bays. A volcanic arc stretches from north to south in the west side of Halmahera, some of which are volcanic islands, for instance, Gamalama and Tidore. Gamalama's island name is Ternate and it has been the centre for spice trading since the Portuguese Empire opened a fort in 1512. Due to its location as the centre for spice trading during the Age of Discovery, historical records of volcanic eruptions in Halmahera have been available as far back as the early 16th century.
|Name||Shape||Elevation||Last eruption (VEI)||Geolocation|
|Tarakan||pyroclastic cone||318 metres (1,043 ft)||unknown|
|Dukono||complex volcano||1,335 metres (4,380 ft)||1933-2019 (ongoing)|
|Tobaru||unknown||1,035 metres (3,396 ft)||unknown|
|Ibu||stratovolcano||1,325 metres (4,347 ft)||2008-19 (ongoing)|
|Gamkonora||stratovolcano||1,635 metres (5,364 ft)||9 July 2007 (?)|
|Todoko-Ranu||caldera||979 metres (3,212 ft)||unknown|
|Jailolo||stratovolcano||1,130 metres (3,710 ft)||unknown|
|Hiri||stratovolcano||630 metres (2,070 ft)||unknown|
|Gamalama||stratovolcano||1,715 metres (5,627 ft)||2018|
|Tidore||stratovolcano||1,730 metres (5,680 ft)||unknown|
|Mare||stratovolcano||308 metres (1,010 ft)||unknown|
|Moti||stratovolcano||950 metres (3,120 ft)||unknown|
|Makian||stratovolcano||1,357 metres (4,452 ft)||29 July 1988 (3)|
|Tigalalu||stratovolcano||422 metres (1,385 ft)||unknown|
|Amasing||stratovolcano||1,030 metres (3,380 ft)||unknown|
|Bibinoi||stratovolcano||900 metres (3,000 ft)||unknown|
Below is a list of selected major eruptions of volcanoes in Indonesia, sorted chronologically by the starting date of the eruption. Only eruptions with scale 3 or above on VEI are given with known sources and fatalities, except if smaller scale eruptions resulted some fatalities.
|Eruption date||Volcano||Cessation date||VEI||Characteristics||Tsunami||Tephra volume||Fatality||Sources|
|21 December 2018||Anak Krakatoa||10 January 2019||4||cv,se,pf,fa,lm,cc||1–2 m||N/A||437|||
|13 February 2014||Kelut||15 February 2014||4||cv,cl,pf,ph,ld,lm||no||0.16 km3||4|||
|3 November 2010||Merapi||8 November 2010||4||cv,pf,ld,lm||no||N/A||353|||
|10 February 1990||Kelut||March 1990||4||cv,cl,pf,ph,ld,lm||no||0.13 km3||35|||
|18 July 1983||Colo||December 1983||4||cv,pf,ph||no||N/A||0|||
|5 April 1982||Galunggung||8 January 1983||4||cv,pf,lf,lm||no||0.37 km3 +||68|||
|6 October 1972||Merapi||March 1985||2||cv,pf,lf,ld,lm||no||0.021 km3||29|||
|26 April 1966||Kelut||27 April 1966||4||cv,cl,pf,lm||no||0.089 km3||212|||
|17 March 1963||Agung||27 January 1964||5||cv,pf,lf,lm||no||1 km3||1,148|||
|31 August 1951||Kelut||31 August 1951||4||cv,cl,pf,lm||no||0.2 km3||7|||
|25 November 1930||Merapi||September 1931||3||cv,rf,pf,lf,ld,lm||no||0.0017 km3||1,369|||
|19 May 1919||Kelut||20 May 1919||4||cv,cl,pf,lm||no||0.19 km3||5,110|||
|7 June 1892||Awu||12 June 1892||3||cv,pf,lm||yes||N/A||1,532|||
|26 August 1883||Krakatoa||February 1884||6||cv,se,pf,fa,lm,cc||15–42 m||5–8.5 km3||36,600|||
|15 April 1872||Merapi||21 April 1872||4||cv,pf||no||0.33 km3||200|||
|2 March 1856||Awu||17 March 1856||3||cv,pf,lm||yes||0.51±0.50 km3||2,806|||
|8 October 1822||Galunggung||December 1822||5||cv,pf,ld,lm||no||1 km3 +||4,011|||
|10 April 1815||Mount Tambora||15 July 1815||7||cv,pf,cc||1–2 m||160 km3||71,000+|||
|6 August 1812||Awu||8 August 1812||4||cv,pf,lm||no||0.55±0.50 km3||963|||
|12 August 1772||Papandayan||12 August 1772||3||cv,ph||no||N/A||2,957|||
|4 August 1672||Merapi||unknown||3||cv,pf,lm||no||N/A||3,000|||
|1586||Kelut||unknown||5||cf,cl,lm||no||1 km3 +||10,000|||
|≈ 74,000 BP||Toba||unknown||8||pf,lf,cc||likely||2,800 km3||Possible near extinction of all the human population|||
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